Apparatus for testing air or other gases.



M. ARNDT. APPARATUS POB. TESTING AIR 0B. OTHER GASES.

`..1 PL10AT10N 'FILED JAMA. 1910.

Patented June 10, 1913.

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M, ARNDT. APPARATUS FOR TESTING AIR 0B. OTHER GASES.

APPLIQATION FILED JANA, 1910.

1,063,946, Patented June 10, 1913.

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MAX ARNDT, OF AIX-LA-CHAPELLE, GERMANY.

APPARATUS FOR TESTING AIR 0R OTHER GASES.

ISpecification of Letters Patent.

Patented J une 10, 1913.

Application tiled January 4, 1910. Serial No. 536,387.

To all whom 'it may concern:

Be it known that I, Max ARNDT, a subject of the German Emperor, residingat the city of Aix-la-Chapelle, in the Kingdom of Prussia, GermanEmpire, have invented certain new and useful Improvements in Apparatusfor Testing Air or other Gases; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and toletters or figures of reference marked thereon, which form a part ofthis specification.

My invention relates to apparatus for testing air or other gases, inwhich the admixture of certain kinds of gases is determined by thedecolorizat-ion of a reagent.

The liquid reagent can readily lose its etlicacy when preserved 'for along time, and therefore devices are necessary Yfor preparing the threadfor testing the gas or air at the very moment when the test is to begin.To this end, I provide an apparatus in which the thread passes through areceptaele, in which the liquid reagent flowing into said receptaclefrom a small reservoir is supplied to the thread.

Some illustrative embodiments of my invention are represented by way ofexample in the accompanying drawing, wherein:-

Figure 1 is an elevation, partly in section, showing one form ofapparatus, Figs. 2 and 3 are vertical sections showing modified forms,Fig. 4t is a detail View, and-Figs. 5 and 6 are vertical sectionsshowing other modiiied Yforms of my apparatus.

Referring firstly to F ig. l, a roller or spool s carried by axle f androtated continuously or intermittently by clockwork mounted in casing z'carries around it the testing thread a which passes through a U- shapedreagent receptacle L. This receptacle is carried by and is in openrelation through duct c with a reservoir d for the liquid reagent c intowhich the storage vessel @2 for the store c1 of reagent opens. Thethread a comes Jfrom a roller or spool a1, passes thence to the benttube Z) and then along a scale to roller s.

c3 is the outlvv A of vessel e2 through which air enters when the liquidin reservoir d is used up and passes from vessel e2 to reservoir d.

Instead of thread (r a band or other body of absorbent material may beused if preferred.

This apparatus operates the testing thread consists, white yarn preparedwith phenolphthalein and the liquid reagent c ot lime water, whenentering into receptacle thread a absorbs a portion of the smallquantity ot' lime water contained in this receptacle and obtains anintensive violet color with which it leaves receptacle Z1, to whichfresh lime water flows slowly through duct c. This duct or tube c may bea capillary tube so that when the thread contacts with the liquidreagent the colored liquid is prevented from returning to the store clof lime water in vessel c2. As the thread a, which is now exposed to theair to be tested, moves uniformly nd loses its violet color more rapidlythe, more the air, for example, surrounding it contains carbon. dioxid,from the place onward atwhich the thread appears white again the natureof the air in each instance can be read on scale 71,. In like mannerand, it necessary. by means of other reagents, other kinds of gases canbe tested t'or the admixture o't. a special gas.

In the illustrative embodiment shown in Fig. 2, in which correspondingparts are designated with like characters as in Fig. 1, the testingthread a passes through the U- tube and` after going over a roller r,down scale 7i. This apparatus comprises an inverted open flask c2containing the store c1 of a colored liquid reagent, a reservoir (Zcarrying said flask` containing a small quantity ot' the liquid reagentc, and connected by duct or tube c with the test-tube or rcagentreceptacle 7), a thread ot yarn a, scale L and a supply of yarn al. Thepart of the thread a in receptacle 7) absorbs some of the liquidreagent. iVhen the thread has absorbed such a tptantity of the reagentin reservoir (Z that the neck c of flask c2 is exposed bclow, a bubbleot air enters into the neck of the flask, in which manner, as is known`the level of the liquid in reservoir (Z and in receptacle 7) ismaintained approximately constant. The lower the end of thread a. islocated below the, level of the reagent, the greater will theabsorbability of the thread be and the more frequently will the reagentleave the end of the thread in drops t. After a certain time a freshportion of thread is unwound from the supas follows z-If for example, ot

ply 'al and the previously used portion is cut off, in order thus toobtain a new testing thread a.

In the illustrated embodiment according to Fig. 3 t-he apparatus has thesame arrangement for maintaining as constant a quantity of the liquidreagent as possible in the reservoir (Z and tubes o and b, but adefinite length of the testing thread a hangs in .a funnel-like dish s1to which the liquid reagent is supplied in drops 251 by means of aspecial thread a3. A fresh piece of yarn a of definite length issuspended in the dish s1 and absorbs the liquid dropping fromthe threada3 and finally delivers it in drops t. Tube or receptacle Z) ispreferably here made S-shaped.l 4

Fig. 4 shows the arrangement at or on thread a, of optional indicatorsm, such as pieces of filter paper which absorb the liquid reagent fromthe thread.

yIn the modification illustrated in Fig, 5

'the supply of the testing thread al is accommodated in a closed chamberm communicating with the inverted U tube or receptacle b; the threadpasses through the liquid reagent and is then suspended infront of ascale on a rod S that forms the support for the testing apparatus and towhich it is secured by a socket f.

In the modication illustrated in Fig. 6 the supply a1 of the testingthread is preserved together with the liquid reagent e in the sameclosed chamber g.

I claim:-`

l. In apparatus for testing air and other gases in which the admiXtureof a gas is determined by the deeolorization of a liquid reagent, thecombination with movable means for absorbing a reagent, of reagentvdelivering means to guide said absorbing means during its passagetherethrough and to change its direction of movement, and means tosupply liquid reagent to the delivering means malntained under asubstantially constant hydraulic head.

2. In apparatus for testing air and other gases, in which the admixtureof a `gas is determined by the decolorization of a body prepared with aliquid reagent, the combination with a receptacle, of a reservoir forthe liquid reagent in open relation therewith, a thread passing throughsaid receptacle, and a scale arranged in operative relation with respectto said thread.

8. In apparatus for testing air and other gases, in which the admiXtureof a'gas is determined by thedecolorization of a bodyl prepared with aliquid reagent, the combi-4 nation with a receptacle, of a reservoir forthe liquid reagent in open relation therewith, an inverted vesselcontaining a supply of the reagent and opening into said reservoir, athread passing through said receptacle, and a mechanically driven rollercarrying said thread.

4L. In apparatus for testing air and other gases, in which the admixtureof a gas is determined by the decolorization of a body prepared with aliquid reagent, the combination with a receptacle, of a reservoir for-the liquid reagent in open relation therewith, an inverted vesselcontaining a supply of the reagent and opening into said reservoir, amechanically driven roller, a second roller, and a thread passing overthe former roller, through said receptacle, upwardly to said secondroller and downwardly.

5. In apparatus for testing gases, the combination with a filamentousabsorbing body; of a U-shaped guide therefor, means to supply liquidreagent to said guide under substantially a constant hydraulic pressure,said guide and means in open relation to one another.

6. In apparatus for testing gases, the combination with an absorbingyarn; of a U-shaped guide therefor, a reagent supply means and acapillary connection between said guide and means.

7. In apparatus for testing gas, the combination with means to maintaina constant reagent liquid level, of a thread, a thread guide connectedto said means, and mechanism to move the thread through the guide toabsorb said reagent.

8. In apparatus for testing gas, the combination with means to maintaina constant liquid reagent level; of a thread, a thread guide connectedto said means and adapted to change the direction of travel of thethread, and means to move the' thread through the guide.

9. In apparatus for testing gas, the combination with means to maintaina constant liquid reagent level; of a thread, a thread guide in whichthe thread changes its d1- rection of travel during its passagetherethrough, a capillary connection between said uide and means, andmeans for moving the thread through the guide.

In testimony that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

MAX ARNDT.

Witnesses: Y

HENRY ANADFLIEG, ELIsE KoLBUsoH.

